Forget what the mainstream media or some "celebs" write or say.
Listen to people who work on Bitcoin since many years and know what they are talking about. Not the hypers who are just interested in public attention and making a quick buck.
Bitcoin hitting the $500k area in three years is not possible imo. Maybe $100k-$150k at a sustainable level, but not more. And even that would be still very impressive. Why this is possible? Well in mid 2020 we will have the next halving, cutting block reward down to 6.25 coins per block. I expect to see 1-2 ETFs until then, much more big investors getting in, like pension funds etc, due to Bitcoin's deflationary effects and not correlating with traditional assets.
$500k can happen for sure, but this will take another ~10 years at least. So not before 2027-2028.
But this all will only be possible if Bitcoin keeps being the number one coin and being the anchor for anything else getting build in this space.
I share similar thoughts with you,500k $ in three years is just too much and I do not know what should happen to achieve this price.Last year was great regarding price increase,but it is difficult(or impossible) that same thing happen again this year.I have my calculation for the next 10 years based just on simple speculation that price will go up only 50% every year.So if we took 15k$ as start,then 2027 we would have 576K for one BTC,and in year 2023 we cross 100k $ level.
I know there is people who expect more rapid growth,but if price go up growth is likely to slow down.Even 50% per year may sound somehow optimistic,but it is still more realistic then 500k $ in next three years.